hey all....

I know how to build a 4 cylinder turbo car.. btu when it comes to a v-8 I need some help..

We are starting with a 305 or a 350 sbc
things we need to know what ppl are using for rods, pistons, head , valves, cam, injectors, Ignition, standalone, Fmu?

Our goal is to run 10's and make 600+ hp

Can the stock block handle 600 hp?

We plan on using 3 inch ic piping, a huge fmic, tial wastegate and BOV,

Please get back to me.

 

uummmmm yea, a stock block better handle 600 hp, it's the internals you have ot be worrried about.

7-8.1 compression would allow you to run some sick boost and forged pistons/pink rods are a must.

i don't know about the crank.

 

Yeah, Banks Twin Turbo, been doing kits for stock sbcs for years. 6-7 psi is relatively safe, any more than that on stock internals and you are asking for trouble.

 

Id hope the stock block could handle that... I mean we took a stock pistion stock rod in a eagle talon and ran 30 psi and put down 530 hp that was with 8.5:1

I think we are looking at running 8.0:1 or 8.5:1

I still need to know what pistons and rods to use thanks!!!

 

welcome to the world of V-8's. I'm gonna let you in on a secret. They are just like two of your 4's jambed together. I find it best to take what I'm used to in a V-8 and convert what ever I'm trying to calculate ( injecotors, air flow) and divide it by the displacement then multiply it by the displacement of the 4 banger in my case and that gets me close. What will be different from what your used to is the price of parts and the air flow per port will be huge compared to your 2.0L A good set of heads on a v-8 flow close to 300 cfm per port, I looked up some flow numbers for a 4 cylinder and got scared and started woundering how in the hell they made all the power they were making with those small heads. The cool thing about 4-bangers is that they have a good bit of hp per cu/in so the factory used alot of good forged stuff. Not the case with v-8's. Cranks and piston's are cast and the stock rods suck. You need to replace all of them. Mahle makes wicked coated pistons, JE is what nascar uses. Eagle makes good forged rods, Oliver is what the pro's use. As for cranks their are tons of them. I look to the circle track mags for good rotating parts, since they are the hardest on them. You'll find out that your gonna pay the same price for 8 items as you did for 4 so in that aspect it'll be cheaper. As for blocks, a 2 bolt should be good to 500 hp with ARP studs. 4 bolt should be good to 750ish with stock bolts and way over a 1000 with ARP studs. John Meany made 1200 hp with 15 pounds of boost you shouldn't need much more than 600-700 hp to get into the 10's with a school bus.

 

thanks for geting back to me!!!
Im not used to buildin v-8's so this is all new to me.
we plan on going with a built 305-350 depending on what we can find. If i can make 500 plus hp on a 2.0l im sure a 5.0 can make twice that!!! just need to know which rods and pistons ect./
what do ppl use for fuel management? In the import world we use apex Safc Aem, VPC, FMU's. .....what injectors? do you use Ihave 680 cc for my 4banger..

I use a pte sc61 turbo on my 4 banger.. What do you guys use?
please tell me a t-4? We have a few turbo's laying around
t3t4 with 70 A/R compressor side and 1.0 Ar exhaust side we may try that on the trans am 5.0 /5.7 or we have (2) T4's to4's with big exhaust side's i think we will play around and find out whats good ...

 

Go with a 350, you'll make more power and cost less. 305's use a small bore that will limit the valve size you can go with, and pistons are more expensive. I'm no turbo expert but I have seen some guys making over 500-600 hp with dual T-3's so t04's should be nuts.
As for injectors, I need to break out my cc to lb/hr calculator. Your making 250ish hp per liter so converted over to v-8 thats 1420 hp.......So you'll basically need half the injector to feed the v-8. There are some good injector calculators on the net. RCI has one on their site, and it'll even let you put in 8 CYL!!!! As for fuel managment. Accel DFI is a popular choice....but you can use a stock ecm off of a Syclone or Typhoon, or a turbo sunbird from the late 80's and then learn to burn your own chips over on the DIY prom board. Gm ecm's are way more advanced than any of the aftermarket ecm's. So they have a steeper learning curve, but you can make your 600+ hp street monster take Miss Daisy to church on sunday.
One of the biggest differences between your small 4 and our big 8's is tht your not gonna have to or be able to run crazy boost numbers. Your moving volume with a big motor so you don't have to cram all that extra air into a small space. Your just gonna be efficiently moving more air into a big space. When you build this thing make sure you spend the money on the heads, they will make it so much easier on you to make the power your wanting, also aftermarket heads have a much more efficient combustion chamber when compared to stock, so it'll be less prone to detonation.

 

Thanks for the info!!

I hear bad stuff about JE pistons in the import world.. they any good for a 350? Eagle rods are good for the imports are they good for v-8s?

 

Eagle products seem to be pretty good, I haven't ran any of their stuff personally. As for JE that surprises me. I have a friend at Nascar tech, and he says all the motors they have there for them to learn on are old nascar motors and 90% run JE pistons. I would really look into Mahle pistons, they may seem like they cost a little more but they come ready to rock with rings, coatings, and all the sharp edges smoothed over. I can't wait to try them, they have been big in Europe for decades but they have just recently come into the US performance market. One company you want to stay away from at the moment is Scat, there is supposedly a lawsuit pending because they have been using subgrade materials in their products, I.E. 4130 cranks that aren't made from 4130 steel.

Parts for chevys are vast, you have to do some research and decide for yourself whats best. In the import world your limited by the small number of companies that produce parts so you have to run whats available. If you get your self a good set of H-beam rods and good forged pistons and a decent forged crank you won't have any problems. You'll probably end up running a decent size cam. If you do, do your self a favor and check everything. Pushrod engines have quite a bit more moving parts and you can get into trouble by just bolting on parts and expecting them to hold up to the lift thats printed on the box. Pay special attention to your spring installed height as well as spring retainer to seal clearance. Also make sure your running the correct seat and open pressures. This is crucial if your going to be reving this thing past 6000. Theirs lots of good info on these boards, just click the search feature and start reading you'll be here a while.

 

Thanks again for the info. I was thinking the scat was a good crank so i guess i will stay away from that..

 

Check out my site:

Http://www.geocities.com/kingtaling

I built a motor for twin turbos, then built a transmission to handle the motor (700R4 overdrive) then I built myself some twin turbo manifolds and twin turbo'd the sucker, made a ton of power only to lose the motor because I skimped on a $500 set of roller lifters.

But yeah, anyways, lol my site has all the parts and pieces I used to build the motor to handle 600-700 horsepower including the tranny pieces that were used. just click the links.